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INTERINkNAL TECHNOLOGY CORPORATION <br /> i <br /> 2.0 Plan of Action <br /> IT plans to perform an additional offsite investigation at Pacific Bell Facility UE042 on San <br /> i <br /> �69 Joaquin Street in Stockton, California in order to further characterize offsite soil and <br /> groundwater quality downgradient of the former and existing underground storage tank <br /> locations. The investigation has the following goals: <br /> t 1. Additionally examine the possible offsite impact (if any) to soil quality by <br /> L petroleum hydrocarbons from this site. <br /> 2. Additionally examine the possible offsite impact (if any) to groundwater quality <br /> by petroleum hydrocarbons from this site. <br /> ' 3. Further identify the subsurface geology surrounding the site. <br /> 4. Evaluate all results and recommend any further action at the site that may be <br /> ` warranted. <br /> 5. Coordinate all field work with Pacific Bell as well as local and regional regulatory <br /> agencies. <br /> To accomplish these goals, IT plans to drill six soil borings (Figure 3). The soil boring <br /> locations were identified to examine two potential petroleum hydrocarbon sources: the three <br /> existing 25,000 gallon diesel UST's and the two former diesel tanks (300 and 550 gallon) <br /> previously closed in place. Borings will be installed so that SB-1 is located upgradient of <br /> t <br /> both the existing and former tank locations, SB-2 will be immediately downgradient of the <br /> existing tanks, with borings SB-3 through SB-5 situated downgradient of both previous and <br /> existing tank fields and SB-6 is planned side gradient of the former tank locations. A mobile <br /> lab will be used to analyze soil and groundwater samples from the open boreholes. <br /> 1 Groundwater monitoring wells, for continued observation, may subsequently be installed in <br /> two boreholes based on analytical results. If no petroleum hydrocarbons are detected, no <br /> additional monitoring wells will be installed. Where applicable, field investigation methods <br /> L will follow the Tri-Regional Board Staff Recommendations for Preliminary Evaluation and <br /> I Investigations of Underground Storage Tank Sites, 10 August 1990. The following section <br /> describes the procedures that will be used in completing the investigation. <br /> MZW-28-92JENG/9781MM 3 <br />